// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_NETWORK_OBSERVER_H_
#define CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_NETWORK_OBSERVER_H_

#include "base/bind.h"
#include "base/macros.h"
#include "content/browser/background_sync/background_sync.pb.h"
#include "content/common/content_export.h"
#include "net/base/network_change_notifier.h"

namespace content {

class CONTENT_EXPORT BackgroundSyncNetworkObserver
    : public net::NetworkChangeNotifier::NetworkChangeObserver {
public:
    // Creates a BackgroundSyncNetworkObserver. |network_changed_callback| is
    // called when the network connection changes asynchronously via PostMessage.
    BackgroundSyncNetworkObserver(const base::Closure& network_changed_callback);

    ~BackgroundSyncNetworkObserver() override;

    // Enable or disable notifications coming from the NetworkChangeNotifier. (For
    // preventing flakes in tests)
    static void SetIgnoreNetworkChangeNotifierForTests(bool ignore);

    // Returns true if the state of the network meets the needs of
    // |network_state|.
    bool NetworkSufficient(SyncNetworkState network_state);

    // NetworkChangeObserver overrides
    void OnNetworkChanged(
        net::NetworkChangeNotifier::ConnectionType connection_type) override;

    // Allow tests to call NotifyManagerIfNetworkChanged.
    void NotifyManagerIfNetworkChangedForTesting(
        net::NetworkChangeNotifier::ConnectionType connection_type);

private:
    // Calls NotifyNetworkChanged if the connection type has changed.
    void NotifyManagerIfNetworkChanged(
        net::NetworkChangeNotifier::ConnectionType connection_type);

    void NotifyNetworkChanged();

    net::NetworkChangeNotifier::ConnectionType connection_type_;

    // The callback to run when the network changes.
    base::Closure network_changed_callback_;

    // Set true to ignore notifications coming from the NetworkChangeNotifier
    // (to prevent flakes in tests).
    static bool ignore_network_change_notifier_;

    DISALLOW_COPY_AND_ASSIGN(BackgroundSyncNetworkObserver);
};

} // namespace content

#endif // CONTENT_BROWSER_BACKGROUND_SYNC_BACKGROUND_SYNC_NETWORK_OBSERVER_H_
